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Modelling of Tgs Growth in Space

Published online by Cambridge University Press:  15 February 2011

L. C. Liu ,
W. R. Wilcox ,
R. Kroes  and
R. Lal
L. C. Liu
Affiliation:
Department of Chemical Engineering, Clarkson College of Technology, Potsdam, New York 13676, USA
W. R. Wilcox
Affiliation:
Department of Chemical Engineering, Clarkson College of Technology, Potsdam, New York 13676, USA
R. Kroes
Affiliation:
Space Science Laboratory, NASA Marshall Space Flight Center, Huntsville, Alabama 35812, USA
R. Lal
Affiliation:
Department of Physics, University of Alabama A & M, Normal, Alabama 35762, USA
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Abstract

To maintain a constant growth rate in the absence of convection it is necessary to program down the temperature. Trial and error numerical computations were performed to find the first approximation for the required isothermal dissolution period, linear ramp; and polynomial temperature variation period. The linear ramp rate was limited by the specified maximum temperature gradient. The isothermal dissolution turned out to be unnecessary. The linear ramp had to be stopped before the polynomial period was begun to avoid overshooting the specified maximum growth rate. After a few hours the temperature profile approached steady state behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 389
Copyright
Copyright © Materials Research Society 1982

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Footnotes

*

Present address: Halcon R & D Corp., New York, NY 10016.

References

REFERENCES

1.Liu, L-C., “Computer Simulation of Growth of a TGS Crystal from Solution in Space,” M.S. Thesis, Clarkson College of Technology (1981).Google Scholar
2.Davey, R. J. and White, E. A. D., J. Crystal Growth 30, 125 (1975).10.1016/0022-0248(75)90211-0Google Scholar
3.Subramanian, R. S. and Weinberg, M. C., AIChE Journal 27 (Sept. 1981).Google Scholar